CN107689441A - A kind of electrodes of lithium-ion batteries - Google Patents
A kind of electrodes of lithium-ion batteries Download PDFInfo
- Publication number
- CN107689441A CN107689441A CN201610632969.XA CN201610632969A CN107689441A CN 107689441 A CN107689441 A CN 107689441A CN 201610632969 A CN201610632969 A CN 201610632969A CN 107689441 A CN107689441 A CN 107689441A
- Authority
- CN
- China
- Prior art keywords
- electrolyte
- guiding gutter
- active layer
- lithium
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of electrodes of lithium-ion batteries, including collector and coated on the active layer on collector, the active layer surface is provided with electrolyte guiding gutter, the water conservancy diversion trench bottom is provided with the electrolyte pod apertures through the collector, and the depth of the electrolyte guiding gutter and the ratio of the active layer thickness are 1:2 to 1：1.
Description
Technical field
The present invention relates to technical field of lithium ion, in particular it relates to a kind of electrodes of lithium-ion batteries.
Background technology
With the development of new-energy automobile, lithium ion battery due to having the advantages that energy density is high, good cycle, by
To the extensive concern of people.
Lithium ion battery is mainly made up of positive pole, negative pole, barrier film and electrolyte.Positive pole includes current collector aluminum foil and is coated on
The active layer of collection liquid surface, active layer include positive electrode active materials (such as NCM, NCM, LMO, LCO), conductive agent and binding agent；
Negative pole includes copper foil of affluxion body and the active layer coated on collection liquid surface, and active layer includes negative active core-shell material (such as graphite, Si
Material, SiO materials, Si-C composites), conductive agent and binding agent.Active material, conductive agent and binding agent, which are mixed into, to be homogenized
Material, coated on collection liquid surface, after drying, pole piece is rolled the size that pole piece to certain thickness, is then cut to needs, so
Battery is assembled into using the modes such as lamination or winding, and barrier film together afterwards.After cell package, a certain amount of electricity is injected into battery
Liquid is solved, a period of time is shelved, makes electrolyte complete wetting battery plus-negative plate pole piece, then carry out Battery formation.
In above-mentioned lithium ion battery manufacturing process, speed, the infiltration uniformity of electrolyte infiltration positive/negative plate, Yi Ji electricity
Pond electrolyte inside infiltration uniformity plays very important effect to battery producing efficiency and battery performance.As people are to lithium
The requirement more and more higher of ion battery volume energy density and mass energy density, the active layer surface density and pressure of both positive and negative polarity pole piece
Real density is required for improving.After both positive and negative polarity active layer surface density and compacted density improve, the wet-out rate of electrolyte wherein
And the uniformity of infiltration can become worse, inside battery uniformity can also be reduced, and battery high rate performance and cycle performance all can
It is affected.On the other hand, after both positive and negative polarity active layer surface density greatly improves, the electrolyte content that unit area needs increases, but
That compacted density improves and can reduce the liquid absorption of electrolyte, with the circulation of battery, electrolyte content may proceed to reduce, battery it is bad
Changing can be more serious.
It is, thus, sought for a kind of method come improve electrolyte infiltration both positive and negative polarity pole piece speed, improve the internal resistance of cell electricity
The uniformity and uniformity of liquid infiltration are solved, improves battery electrolyte liquid absorption.
The content of the invention
The invention provides a kind of electrodes of lithium-ion batteries, including collector and coated on the active layer on collector, institute
To state active layer surface and be provided with electrolyte guiding gutter, the water conservancy diversion trench bottom is provided with the electrolyte pod apertures through the collector,
The depth of the electrolyte guiding gutter and the ratio of the active layer thickness are 1:2 to 1：1.
Further, the electrolyte guiding gutter, which is parallel to each other, is distributed in active layer surface.
Further, the electrolyte guiding gutter intersects in net distribution in active layer surface, at least one electrolysis
The crosspoint of liquid guiding gutter is provided with electrolyte pod apertures, the electrolyte return guide trough into net be square, rectangle, water chestnut
One or more in shape, triangle, hexagon, circle or irregular shape.
Further, the electrolyte guiding gutter is distributed with predetermined spacing, and the spacing of adjacent electrolysis liquid guiding gutter is
100um~20mm.
Further, the section of the guiding gutter is trapezoidal or square that the water conservancy diversion groove bottom width is 10~100um.
This programme has the beneficial effect that：
The setting of electrolyte guiding gutter and electrolyte pod apertures, it is possible to increase infiltration speed of the electrolyte in both positive and negative polarity pole piece
Rate and infiltration uniformity, the uniformity of inside battery electrolyte infiltration is improved, increase the diffusion path of electrolyte ion.In addition,
The setting of electrolyte guiding gutter and electrolyte pod apertures adds the space of inside battery electrolyte storage, can improve inside battery
Electrolyte protects liquid measure.The lithium ion battery that the positive plate and/or negative plate adopted the structure makes, after fluid injection, electrolyte leaching
Moisten speed to improve, inside battery uniformity is more preferable, liquid absorption increase, can improve the high rate performance, power-performance and circulation of battery
Performance.In addition, electrolyte water conservancy diversion groove depth and the proper proportion of active layer thickness can further improve electrolyte wet-out rate,
And further improve the performance of battery.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1, Fig. 2 are provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte
Guiding gutter be arranged in parallel.
Fig. 3 is provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte water conservancy diversion
The square netted setting of groove, electrolyte pod apertures are located at guiding gutter infall.
Fig. 4 is provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte water conservancy diversion
Groove is rectangle netted setting, and electrolyte pod apertures are located at guiding gutter infall.
Fig. 5, Fig. 6 are provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte
Guiding gutter assumes diamond in shape netted setting, and electrolyte pod apertures are located at guiding gutter infall.
Fig. 7 is provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte water conservancy diversion
Groove netted setting triangular in shape, electrolyte pod apertures are located at guiding gutter infall.
Fig. 8 is provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte water conservancy diversion
The hexagonal netted setting of groove, electrolyte pod apertures are located at guiding gutter infall.
Fig. 9 is provided with electrolyte guiding gutter and the battery pole piece structural representation of electrolyte pod apertures, electrolyte water conservancy diversion
The rounded netted setting of groove, electrolyte pod apertures are located at guiding gutter infall.
Figure 10 is electrolyte guiding gutter cross section structure schematic diagram, and sectional position passes through electrolyte pod apertures.
Figure 11 is electrolyte guiding gutter cross section structure schematic diagram, and sectional position does not pass through electrolyte pod apertures.
With reference to accompanying drawing, reference is as follows in the embodiment of the present invention：
1st, collector；2nd, active layer；3rd, electrolyte guiding gutter；4th, electrolyte pod apertures.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein preferred real
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
A kind of electrodes of lithium-ion batteries, it includes collector 1 and the active layer 2 coated on collector tow sides.Afflux
Body 1 can be the negative or positive electrode of lithium ion battery, and plus plate current-collecting body is generally aluminium foil, positive-active aspect density is 100~
600g/m2, negative current collector is generally copper foil, and negative electrode active aspect density is 50~400g/m2.In one embodiment, afflux
Body 1 is copper foil, and active layer surface density is 200g/m2, the thickness of collector 1 is 10um, the active thickness after pole piece roll-in per one side
Spend for 77um.In another embodiment, collector 1 is aluminium foil, and active layer surface density is 330g/m2, the thickness of collector 1 is
20um, the active layer thickness after pole piece roll-in per one side is 50um.
Further, the active layer surface of electrodes of lithium-ion batteries is provided with electrolyte guiding gutter 3, electrolyte guiding gutter 3
Bottom be provided through the electrolyte pod apertures 4 of collector 1.Enter between adjacent electrolyte guiding gutter 3 with predetermined interval
Row distribution.The spacing of adjacent electrolysis liquid guiding gutter is 100um~20mm, and pole piece surface density, compacted density, active material compare surface
, it is necessary to adjust the spacing of electrolyte guiding gutter during the parameter differences such as product, the too small mechanical strength that can influence pole piece of spacing, spacing mistake
It is big then preferable beneficial effect can not reached.The trend of electrolyte guiding gutter can be adjusted according to the particular location of battery liquid-filling mouth
It is whole.The electrolyte guiding gutter on pole piece two sides can symmetrically or non-symmetrically be set, or only simultaneously be provided with electrolyte guiding gutter.
Further, electrolyte can intersect in net distribution in pole piece activity layer surface, the crosspoint of at least one electrolyte guiding gutter
Provided with electrolyte pod apertures, electrolyte guiding gutter is square, rectangle, rhombus, three in the net that electrode activity layer surface is formed
One or more in angular, hexagon, circle or irregular shape.
In one embodiment, referring to Fig. 1-2, electrolyte guiding gutter it is vertical or horizontal it is parallel be distributed in the surface of active layer 2,
Electrolyte pod apertures 4 are distributed in electrolyte water conservancy diversion trench bottom.Between adjacent electrolysis liquid guiding gutter 3 at intervals of 800um.Another
In individual embodiment, referring to Fig. 3,3 square net distribution of electrolyte guiding gutter is divided in the surface of active layer 2, electrolyte pod apertures 4
Be distributed in electrolyte guiding gutter infall, between adjacent electrolysis liquid guiding gutter 3 at intervals of 500um.In another embodiment, join
See Fig. 4, electrolyte guiding gutter 3 is rectangle net distribution and is distributed in electrolyte in the surface of active layer 2, electrolyte pod apertures 4 and leads
Chute infall, between longitudinal electrolyte guiding gutter 3 at intervals of 200um, between horizontal electrolyte guiding gutter 3 at intervals of
700um.In another embodiment, referring to Fig. 5-6, electrolyte guiding gutter 3 assumes diamond in shape net distribution in the surface of active layer 2, electricity
Solution liquid guiding gutter 4 is distributed in electrolyte guiding gutter infall, between adjacent electrolysis liquid guiding gutter 3 at intervals of 500um.Another
In individual embodiment, referring to Fig. 7, electrolyte guiding gutter 3 is in equilateral triangle net distribution in the surface of active layer 2, the triangle length of side
For 600um, electrolyte pod apertures 4 are distributed in electrolyte guiding gutter infall.In another embodiment, referring to Fig. 8, electrolyte
3 hexagonal net distribution of guiding gutter is distributed in electricity in the surface of active layer 2, hexagonal side length 400um, electrolyte pod apertures 4
Solve liquid guiding gutter infall.In another embodiment, 3 rounded net distribution of electrolyte guiding gutter is in the surface of active layer 2, circle
The a diameter of 600um of shape, electrolyte pod apertures 4 are distributed in circular the tangent.
Further, the section for being distributed in the electrolyte guiding gutter of pole piece activity layer surface is trapezoidal or square, close to collection
The width of the trapezium base of fluid is 10um~100um, and the width of the trapezoidal top away from collector is wide more than or equal to bottom
Degree, the width of electrolyte guiding gutter could be arranged to equal width, it can also be provided that the width not waited.In one embodiment
In, referring to Figure 10-11, the section of guiding gutter 3 is trapezoidal, and bottom width (leaning on afflux side) is 25um, and top width is (away from collection
Fluid side) 35um, pod apertures 4 are diameter 25um circular through hole, and the spacing between adjacent guide hole is 800um.Another
In one embodiment, the section of guiding gutter 3 is trapezoidal, and bottom width (leaning on afflux side) is 20um, and top width is (away from afflux
Body side) 30um, pod apertures 4 are diameter 20um circular through hole.
Further, electrolyte water conservancy diversion groove depth is the 50%~100% of pole piece active layer thickness, is distributed in active layer table
The electrolyte guiding gutter deep equality in face, can not also be waited.In one embodiment, the thickness of active layer is 77um, electrolyte
The depth of guiding gutter is also 77um.In another embodiment, the thickness of active layer is 50um, the depth of electrolyte guiding gutter
For 50um.
Further, pole piece active layer includes NCM ternary material Li (NixCoyMnz)O2, NCA ternary materials Li
(NixCoyAlz)O2, rich lithium manganese base solid solution material xLi2MnO3(1-x)LiMO2(M=Mn, Ni, Co), LiFePO 4 material
LiFePO4, lithium manganate material LiMn2O4, cobalt acid lithium material LiCoO2, lithium titanate material, graphite material, Si materials, SiO materials
In one or more.
Further, electrolyte guiding gutter and electrolyte pod apertures are using template, physics roll compacting, chemical attack or laser
Method obtains.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (5)
1. a kind of electrodes of lithium-ion batteries, including collector and the active layer coated on collector tow sides, it is characterised in that
The active layer surface is provided with electrolyte guiding gutter, and the water conservancy diversion trench bottom is provided with the electrolyte water conservancy diversion through the collector
Hole, the depth of the electrolyte guiding gutter and the ratio of the active layer thickness are 1:2 to 1：1.
2. electrodes of lithium-ion batteries as claimed in claim 1, it is characterised in that the electrolyte guiding gutter is parallel to each other distribution
In active layer surface.
3. electrodes of lithium-ion batteries as claimed in claim 1, it is characterised in that the electrolyte guiding gutter intersects in net
Shape is distributed in active layer surface, and the crosspoint of at least one electrolyte guiding gutter is provided with electrolyte pod apertures, and the electrolyte is led
The net that chute is formed is one kind or more in square, rectangle, rhombus, triangle, hexagon, circle or irregular shape
Kind.
4. such as the electrodes of lithium-ion batteries any one of claim 1-3, it is characterised in that the electrolyte guiding gutter with
Predetermined spacing distribution, the spacing of adjacent electrolysis liquid guiding gutter is 100um~20mm.
5. lithium-ion electric pole piece as claimed in claim 4, it is characterised in that the section of the guiding gutter to be trapezoidal or square,
The water conservancy diversion groove bottom width is 10~100um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610632969.XA CN107689441A (en) | 2016-08-04 | 2016-08-04 | A kind of electrodes of lithium-ion batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610632969.XA CN107689441A (en) | 2016-08-04 | 2016-08-04 | A kind of electrodes of lithium-ion batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107689441A true CN107689441A (en) | 2018-02-13 |
Family
ID=61151058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610632969.XA Pending CN107689441A (en) | 2016-08-04 | 2016-08-04 | A kind of electrodes of lithium-ion batteries |
Country Status (1)
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390558A (en) * | 2018-09-29 | 2019-02-26 | 华中科技大学 | A kind of electrodes of lithium-ion batteries and its manufacturing method |
| CN109786662A (en) * | 2019-01-18 | 2019-05-21 | 湖北锂诺新能源科技有限公司 | A kind of negative electrode of lithium ion battery mends pole piece and preparation method thereof |
| CN112103514A (en) * | 2020-08-28 | 2020-12-18 | 深圳供电局有限公司 | Current collector, battery electrode, preparation method and battery |
| CN112350035A (en) * | 2019-08-08 | 2021-02-09 | 比亚迪股份有限公司 | Battery insulation package and battery |
| CN112467073A (en) * | 2020-12-21 | 2021-03-09 | 江苏双登富朗特新能源有限公司 | Lithium ion battery pole piece and preparation method thereof |
| CN112542570A (en) * | 2019-09-23 | 2021-03-23 | 北京小米移动软件有限公司 | Silicon negative pole piece, preparation method thereof and lithium ion battery |
| CN112768627A (en) * | 2021-04-07 | 2021-05-07 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery, and method and apparatus for manufacturing electrode assembly |
| WO2021147409A1 (en) * | 2020-01-22 | 2021-07-29 | 苏州易来科得科技有限公司 | Thick electrode component and manufacturing method for thick electrode tabs |
| CN113871790A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Lithium ion battery pole piece and lithium ion battery |
| CN114203970A (en) * | 2021-11-30 | 2022-03-18 | 华中科技大学 | Electrode piece for improving wettability of lithium battery electrolyte and preparation method thereof |
| CN114203954A (en) * | 2021-11-30 | 2022-03-18 | 华中科技大学 | Lithium battery positive pole piece with corrugated channel structure and preparation method and application thereof |
| CN114497445A (en) * | 2022-02-24 | 2022-05-13 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electric equipment |
| CN114203970B (en) * | 2021-11-30 | 2024-04-19 | 华中科技大学 | Electrode plate for improving wettability of lithium battery electrolyte and preparation method thereof |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390558A (en) * | 2018-09-29 | 2019-02-26 | 华中科技大学 | A kind of electrodes of lithium-ion batteries and its manufacturing method |
| CN109786662A (en) * | 2019-01-18 | 2019-05-21 | 湖北锂诺新能源科技有限公司 | A kind of negative electrode of lithium ion battery mends pole piece and preparation method thereof |
| CN112350035A (en) * | 2019-08-08 | 2021-02-09 | 比亚迪股份有限公司 | Battery insulation package and battery |
| CN112542570A (en) * | 2019-09-23 | 2021-03-23 | 北京小米移动软件有限公司 | Silicon negative pole piece, preparation method thereof and lithium ion battery |
| CN112542570B (en) * | 2019-09-23 | 2022-08-09 | 北京小米移动软件有限公司 | Silicon negative pole piece, preparation method thereof and lithium ion battery |
| WO2021147409A1 (en) * | 2020-01-22 | 2021-07-29 | 苏州易来科得科技有限公司 | Thick electrode component and manufacturing method for thick electrode tabs |
| CN113871790A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Lithium ion battery pole piece and lithium ion battery |
| CN112103514A (en) * | 2020-08-28 | 2020-12-18 | 深圳供电局有限公司 | Current collector, battery electrode, preparation method and battery |
| CN112103514B (en) * | 2020-08-28 | 2022-05-17 | 深圳供电局有限公司 | Current collector, battery electrode, preparation method and battery |
| CN112467073A (en) * | 2020-12-21 | 2021-03-09 | 江苏双登富朗特新能源有限公司 | Lithium ion battery pole piece and preparation method thereof |
| CN112768627B (en) * | 2021-04-07 | 2021-07-20 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery, and method and apparatus for manufacturing electrode assembly |
| CN112768627A (en) * | 2021-04-07 | 2021-05-07 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery, and method and apparatus for manufacturing electrode assembly |
| CN114203970A (en) * | 2021-11-30 | 2022-03-18 | 华中科技大学 | Electrode piece for improving wettability of lithium battery electrolyte and preparation method thereof |
| CN114203954A (en) * | 2021-11-30 | 2022-03-18 | 华中科技大学 | Lithium battery positive pole piece with corrugated channel structure and preparation method and application thereof |
| CN114203954B (en) * | 2021-11-30 | 2024-02-02 | 华中科技大学 | Lithium battery corrugated channel structure positive electrode plate and preparation method and application thereof |
| CN114203970B (en) * | 2021-11-30 | 2024-04-19 | 华中科技大学 | Electrode plate for improving wettability of lithium battery electrolyte and preparation method thereof |
| CN114497445A (en) * | 2022-02-24 | 2022-05-13 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electric equipment |
| CN114497445B (en) * | 2022-02-24 | 2024-03-12 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electric equipment |
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